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(FILES) This file photo taken on October 13, 2015 and obtained on November 24, 2015 by NASA shows the Heimdal Glacier in southern Greenland, captured from NASA Langley Research Center's Falcon 20 aircraft flying 33,000 feet above mean sea level during NASA's Operation IceBridge, an airborne survey of polar ice. - The extent of sea ice in the Arctic was at record lows for October, Danish researchers said Wednesday, October 28, 2020, adding the unusually warm season meant it was not recovering as fast as normal. (Photo by JOHN SONNTAG / NASA / AFP) (KEYSTONE/AFP / NASA/JOHN SONNTAG)